A Patient Diagnosed with Guillain-Barré Syndrome (GBS) Asks How the Disease

A patient diagnosed with Guillain-Barré syndrome (GBS) asks how the disease developed since the patient rarely has an illness. Which nursing response is the most accurate?

A) "No one knows an exact cause."
B) "It may be an autoimmune reaction to a virus."
C) "It most often occurs as a result of a bacterial infection."
D) "It is usually hereditary. Does anyone in your family have it?"